1. update clientset, deepcopy using code-generator

2. add a dummy file tools.go to force "go mod vendor" to see
code-generator as dependencies
3. add a script to update CRD
4. add a README to document CRD updating steps
run go mod tidy
update README

vendor/k8s.io/client-go/kubernetes/scheme/register.go

@@ -39,8 +39,11 @@ import (
 	coordinationv1 "k8s.io/api/coordination/v1"
 	coordinationv1beta1 "k8s.io/api/coordination/v1beta1"
 	corev1 "k8s.io/api/core/v1"
+	discoveryv1alpha1 "k8s.io/api/discovery/v1alpha1"
+	discoveryv1beta1 "k8s.io/api/discovery/v1beta1"
 	eventsv1beta1 "k8s.io/api/events/v1beta1"
 	extensionsv1beta1 "k8s.io/api/extensions/v1beta1"
+	flowcontrolv1alpha1 "k8s.io/api/flowcontrol/v1alpha1"
 	networkingv1 "k8s.io/api/networking/v1"
 	networkingv1beta1 "k8s.io/api/networking/v1beta1"
 	nodev1alpha1 "k8s.io/api/node/v1alpha1"
@@ -87,8 +90,11 @@ var localSchemeBuilder = runtime.SchemeBuilder{
 	coordinationv1beta1.AddToScheme,
 	coordinationv1.AddToScheme,
 	corev1.AddToScheme,
+	discoveryv1alpha1.AddToScheme,
+	discoveryv1beta1.AddToScheme,
 	eventsv1beta1.AddToScheme,
 	extensionsv1beta1.AddToScheme,
+	flowcontrolv1alpha1.AddToScheme,
 	networkingv1.AddToScheme,
 	networkingv1beta1.AddToScheme,
 	nodev1alpha1.AddToScheme,